Neem is used by many as an 'organic' anti-fungal/bacterial/insecticidal.
It has almost mythical properties, like the epsom salts, so most of the claims I take as total nonsense.
However, I do note that it makes all my leaves have a lovely glossy shine after spraying.
So, I use it to pretty-up my garden (and the smell is pleasing, too). If it kills baddies, I consider that a bonus.
If I ever get rust, I think I will try that. It seems to go hand-in-hand with this de-greaser. Neem is probably a surfactant aswell, like detergents (hence the glossy leaves after use).
